Tracing instrument, etc.



Oct. 3, 1933. w. E. TURNER TRACING INSTRUMENT, ETC

Filed Oct. 1Q, 1929 ZZ//Y//am 5 713/776/1 Patented Oct. 3, 1933 UNITED STATES PATENT OFFICE TRACING INSTRUMENT, ETC.

William E. Turner, Tacoma., Wash.

Application October-18, 1929. Serial No. 400,686

1 Claim.

. The present invention relates to improvements intools such as are commonly employed for perforatingV paper in producing patterns or stencils. Q The object of the invention is to provide a very simple and inexpensive article which can be readily manipulated and the parts of which are not likely to be disarranged.

In thev accompanying drawing:

Figure 1 is a longitudinal section through an implement embodying the present invention.

Figure 2 is a transverse section substantially on the line 22 of Figure l on an enlarged scale.

Figure 3 is a similar section substantially on the line 3-3 of Figure 1.

Figure l4 is an elevation and partial section of a slightly modiiied form.

Referring'to the drawing, in the several views of which like parts are designated by correspond-- ing reference characters, the implement, as is customary, includes a solenoid, comprising a coil 1V and core 2, which is suitably supported within a casing 3 having an elongated extension or body 4 that tapers at its freeA end and provides a guide 5 for the shank of a suitable tool or needle 6, the inner or upper end of which is shown as being secured in a socket formed in the lower end of the core 2 by a set screw '7.

The other end of the casing 3 is closed by a head l0 and to said head piece is connected the electric conductor 11 that connects the solenoid with a suitable battery or other source of electricity, not shown.

In the embodiment of the invention illustrated in Figure 1, one of the circuit wires of the conductor 11 is connected to oneterminal of the solenoid winding as at12, the other wire of the conductor being connected as at 13 with the casing 3 which in this embodiment is of conducting material and forms a part of the electric circuit including the solenoid winding.

The other terminal 14 of the solenoid coil is connected to a conductor 15 which is in electrical connection with a manually movable circuit closer 16 that is mounted in a slot in the portion 4 of the implement casing and shown as being provided with an enlarged head 17 by which it may be bodily moved longitudinally of the slot in which it is arranged. The free end of the contact 16 extends into the path of a contact memcircuit including the coil ofthe solenoid is completed through the tool body 6 and the tapered portion 5 of the guide therefor at the outer end of the enclosing casing.

, 1n this form of the invention the extension of the solenoid to which the tool 6 is secured is separated from the other section of said core by a suitable body of insulation 21.

When the coil of the solenoid is energized as described, or the parts are in the relative posin tion shown in Figure 1, the core 2 wiil be drawn upward or within he coil against the opposition of a suitable spring 25, the compression of which will act to return the core or project it from the coil after the circuit has been broken by the contact 20 moving out of engagement with the terminal 16.

Tension on the spring is controlled and may be varied as desired by a set screw 30.

To insure that the movement of the core whenever the solenoid coil is energized will break the contact between the parts 20-16, means may be provided whereby the core member is oscillated at each reciprocation. 1n the embodiment of the invention illustrated in Figures 1, 2 and 3, such means includes an inclined groove formed in the body of the core 2 and a stud 41 connected to the section 4 of the implement easing and which pin is preferably of non-conducting material.

It will be seen that at each inward movement of the core 2 relative to the coil 1, due to the coil being energized as before described, the stationary pin 41 cooperating with the inclined slot 40 will impart a slight oscillating movement to the core and the tool 6 carried thereby so that the contact 20 will be positively moved from electrical engagement with the adjustable terminal 16.

When the implement is not in use, the terminal 16 may be positively moved downward in the slot in the casing in which it is supported so that it is out of contact with the member 20 on the tool, thus breaking the circuit through the solenoid coil.

In the moded form shown in Figure 4, the outward or downward movement of the solenoid core 2 is eiected solely by gravity and, therefore, the implement will only operate when it is held in a substantially vertical position. In this embodiment of the invention, one terminal of the winding or coil 1 of the solenoid is connected with a. contact comprising as shown, two spring fingers 50.

The upper portion of the solenoid core 2 is provided with a reduced section 52 on which are mounted discs 53, 54, the former being of insulating material, for example such as fiber, while the member 54 is of metal or is electrically conductive. In the position shown in the drawing, the circuit through the solenoid coil is broken by the insulating body 53. As the weight of the core 2 and attached tool 6 causes them to move downward, the conducting section 54 will come into contact with the ngers, thus energizing the solenoid coil and causing it to draw the core and tool upwardly.

By this arrangement it will be seen that so long as the implement is held in a substantially vertical position, the core 2 and attached tool will be automatically reciprocated. By moving the implement into any other than a vertical position, reciprocatory movement of the core will be checked. As shown, the core is provided with stops or abutments 55, 56 which limit the vertical reciprocation thereof and the abutment 56 is shown as the means for supporting the circuit closer 54 and insulation member 53, these being held in position thereon by a nut 57 or other suitable fastening means.

While the tool 6 is, as shown, preferably made of substantially the form of a needle, and the improvements as before described are primarily adapted for perforating paper or similar material, yet many advantages may be obtained by substituting a differently formed tool for the one shown. For example, a file, saw or knife could be substituted and used advantageously in the manufacture of jewelry etc. or if preferred, a pencil or pen could be connected with the solenoid core.

Having thus described my invention, what I claim is:

In an implement of the character described, the combination of a solenoid, a tool forming an extension of the solenoid core at the lower end of the latter when the implement is in a vertical position, an electric circuit including two contact fingers, respectively connected to the terminals of the solenoid coil, a circuit closer carried by the solenoid core and adapted to electrically connect said ngers when the core is at the lower limit of its movement relative to the coil, and a body of insulation carried by the core and adapted to be positioned between said fingers at the upward limit of movement of the core due to energization of vthe solenoid coil, said circuit closer and body of insulation comprising aligned discs mounted one upon the other on the core at the extreme top portion thereof, and said core being provided with a shoulder constituting a support for said discs and also forming a. stop to limit the downward movement of said core with respect to the solenoid.

WILLIAM E. TURNER. 

